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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff676385f1d8e1f804b92e9415da9d030e0dd8f60aa973bc0ddef847d02ccba' 
  AND token = 'LtBMighWk3Zjm8D3OrLdl8vn9xVSdKaCT9jWXO47fYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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