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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9e547f986a966db9107eb3a3eba6fd6fda29d34bbfa41a2bfcdf98a4413ef5' 
  AND token = '+rWC4d0VSBHf/2oadB2etqdd8DcatP0MyrCmzlpimYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}