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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ca8ab9d109dc8b79fdf012da1d638773abbecf58dc4f883b4fe43385c82b0f' 
  AND token = 'maaf1+Z1ybgT8mFlBOF3q+3n1kTI7Wn+V38Avq9c8L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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