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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd23a19c6c1104eb345388e155a24d83d563f35d467760d9439a0c8a5cc6a871' 
  AND token = 'FjpRusKuKEuRv/vDzjTrZ8HHPwkKw6e4OyfqMn3PEVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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