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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0eeb74278b70ae28d778a2bef4b3fd1b0c8972bfd7233780d843e1d657640ea' 
  AND token = 'ON5JyDpIsVY2NKsr8nAM6Dg5J5Dvlfnjl5Q7sxa5R6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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