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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e49212ddfbbcdc02c9d7603999a230a2a63121b61a25cb221bae1a71ca483fd' 
  AND token = 'P3eX2bTPy4OHsHSjDFsKhh9103toWUMw9B87iV/CwXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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