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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007a3db76e987b291700fc0b96a09259bab2b2bbabdce6f067d190880c845e08' 
  AND token = 'rrzMC3l5K36buZyFdcvqLKr4glimE8vqz7N/JtZFkiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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