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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb8dc909b8165d7c2bcdc88e17b0872d123217551646a56b69c84da581d1fb8' 
  AND token = 'FvmeR0i2sz8WYSCOUru+zAM727/i+nYb88tt2gASX5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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