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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fccd1c927bf502f63e1229058c2ab0f08ffb31f5eeb04916596ef66b6a94d6' 
  AND token = 'o8FlynQv6eQE2QnGrplsj3Oty2iI0KZZOw6GQlGrQ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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