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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a15d55536fcdb33d37acb614731ca15559a0ac4ade5186a0a25e7b88eec2aa2' 
  AND token = '9vLFm1DfWIeSVl1+714Zgc4HOsVUFFS8JkFhLo58zOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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