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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd70ebf40d05cf84ebfd91293f7d623af262d25dcafd4920abe7f0d19180e6a0' 
  AND token = 'GMDPvyNncW1w1nfGBp69oYdcOyyhVx1VUdPu0R/Z7QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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