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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0772790108eb6108cbc631d26d9e5be71caf656f928e17b44fabfbda039b0b' 
  AND token = 'lnFB3SWXf7jZNgAWTXWbRC3sLjbH4aRaf1l2d3Zy8bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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