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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f0ef3ad3cdd5c410d734af5ae0ff42d3b82884408c0d1072d0df7c6fd0fbec' 
  AND token = 'FIwd13JUjxGlfqRPL8prx1JBJiFCis3RbmB0hXa7aUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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