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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6defc4c611f55f2f87877bf9939ef5b134fac35303f71acdef9c6712df7bbfa' 
  AND token = 'pu7k9i/LbdAc4jCQxb52Y40+HUSResIeboWtE59G300=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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