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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e8904034f862d4964b1cdf4ac600769f9a7390e71c781acb2c068698b45f0d' 
  AND token = 'yFsyF2mca83Ppi5gfpuVa0ddwwKhbDj0sSCBuUx7taI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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