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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee82c6a0bc37d1d3f636969ea065351edd079eb3c97aa5a4b79d0be1420d36c5' 
  AND token = 'P3tc+dNxF7oWDUq2yJdar7koGjzNUUcWZQ9fJuFktx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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