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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa41d83d8e24f1df81c597941a4e8cb261f199232e981adedc21c36928e1b000' 
  AND token = 'zO/z8ktQuv/wpwr50r+G0t4RY4AWOx2KdfrVUoPsNps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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