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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7193a81ab9eb1545f9c32bef8cb3c285691a0cf2660169bc0ec42668700f785c' 
  AND token = 'o+WmFofh9AgEI406KLro4HZExtImVb2n76jMS8Ie1JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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