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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f5af96a06ef098626aae71332c7366004a64dca404e90b8111b10db18d8bdd' 
  AND token = 'EvS0qcReTymEu+2YPRMTcTPicapqFRogCoflzeI80m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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