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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18d09ff5de8b0c44b8f7bdd6a862cb95a948bc3cd43af0f5ecd95fa221c507c' 
  AND token = 'F1SJ7wrGJxMRPfG99LgVRfANul/M1jPD6v2A+/48oiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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