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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5716813dea857bfbe33494447577ff6762d6356534f0a4a035245a6e4c99906' 
  AND token = '9DSSWnVeYrUIHtjJd+5V4w781wbzaNr/lZ1EuP4wEtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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