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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e424b32a6889b50dc773cd0ef2e0d969e35a40ab44df9c79f68ad63aad9a2d' 
  AND token = '/TpzqLLo2Q7qdsNmn0Ia9q0Catceppf3f4ZIUJszpL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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