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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df3f7ba48142b797c4218bed90950e68d97bcb8e3354bf93e92d9d3c11b6072' 
  AND token = 'Unw6lG1EVj0alJgZD0Xni40Bct88PyZbTvux5pCk/jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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