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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bb259d6a04a68cff856e273353ed30d0a4b0d84a939a0973cdb565c00fa74b' 
  AND token = 'PtsD7Fgf/dzguKtC33XEDLHWg4J0W64EjMRuQJ8pBqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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