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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a5d3bb843d576395c328e9c5076c644763bfad68839ccd585f687ce064df7b' 
  AND token = '1akB5Qbvh16EmdKV/z5oLyShpfWMKCCxdkAF5DKmRPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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