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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1829f31521652255d56cdf3670d0e63025d7eb228b2b24c5636312bc44b86bdb' 
  AND token = '/Vp/sqNnldjz91yosyKnvxaERLJ2LXp7yw+I2lryvL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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