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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59402f4c238f2311a1f4f040039935ca4395ee71d7020aa062e3ab3d83099a2e' 
  AND token = 'E5nR7c58YrEus3dx16JHXz6NRJYaJA9ghhehu5X3yZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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