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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc7ffe84550f9a662ce89cd017972a378b5cb3812c5594bb342a53fb0cdf156' 
  AND token = 'JnBlh3y34T+Lm908e+hla448T2EwoKVegk7lV7pWXkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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