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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712c2657c67070f2c4077752cefaa27d03c01b5e3f7acaecd0b8d2bb2e19b9dc' 
  AND token = '+Q34fPmvsPR0n2sUxMPfSodNtTfTQFOZR6NcDy819mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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