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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89f3682896773943f937b60ae706168ba091526eb8151b438fd1fb8b90fb1f3' 
  AND token = '0RMvc7vIo+k7s5K46VSRpXSm9PvA4vOyn2cmZq807VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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