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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87af133bf41a610baffed8caab6dd4d46c5f090889d2fc6398b553c3f9e82e80' 
  AND token = 'DRDPl6E67xFtcDPNHKbU4qqSUS8IOY+iUj+6WfS+4Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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