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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec697e62a57453fcb8189bff0f66bc93772d056bc87f04b9829cedf7bed94a9a' 
  AND token = 'xvzvJLbUWKSuGn6UM9llHLs+ZRky47yEILnqVk2sVtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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