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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34e0f7cfa2fd7f9ad33514b33f931f6ccc415f8c20fa1b8f830953bbd27826a' 
  AND token = 'TPWgsNPSxX9YqxonCHWyw3TmTQhUrsKZ34T8VqLCr1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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