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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d0c5d306c5df39cf937fa6a09826fa60fb4be27e9a973492e23c0f7658a4ef' 
  AND token = 'RYmdAa5qtg6U0nf63e9Hjrg9zkHx8V/G9ZLRNZh9/tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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