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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6e3c8991fe48dda7dc3e3c7d307cdbcfc52400040afa708ce2d8447d0e9910' 
  AND token = '/VT43OEqMf+Ht4lzCAk2AyrKQb3ih0O76e/a721l+G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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