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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7251e00d00c13c2a45d6e0e06b1cbffcf653d90fa7ec834ce1ad945e223026ee' 
  AND token = 'x/j5vcoeCnsxShamwqVaYRvTyyrXIKtc6ThXxyto+xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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