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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121aff0ced72fa528d57e833c20d55654459378f5fab065e4190e132167b03a0' 
  AND token = 'P08rdYKnl+rvnV3E3qePUdiztgYnDggKy4+KMcisaM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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