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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a301365b47d9da1622c6b6a4820a1626cb0ec9461f6bfae5adb6c6b890c173' 
  AND token = '2DQB29K74cCPJJ3mmzbG6zQoWFXU4EPqMlQcvuNNT5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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