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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1686f67f41817ee94c1c98592ebc1d7b32e412dab380e7b59fb768cb8fda199a' 
  AND token = 'ZseHxijEe7pXAAcQSJUGvDEDdsBedkAWXGYpntJK+JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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