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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6790fe49545e786550a1d0b95332725345bb9f0296a4b93c50e1196d7d4d9b4d' 
  AND token = '7mR2GV5j3qeXwR6hn0Axp9fCp607wfWsmPk+3Gr0CoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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