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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0872b0b14ce5b3a1851748569646f14f6e586973a9a6dafd34a1213ae5571a' 
  AND token = 'C7hw91tHJRdjDcfsQvNXv7sKg1uoGtl4RqualVkMeQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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