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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a26e457eeccd3f91c2ac3f020a08352e14f1d9d166e7deb98f3e2634a63dec' 
  AND token = '2JThZ07fbopFNJYrRjbgMZUF2YJIk2ouIC12cR8WSj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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