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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a531ea29fb34cf913a27b6d1c67261cb76bcf63e6a1f2729c1c4ff4b29720d' 
  AND token = 'w5DWsh7o9pZfNd7pkT+bAqelFTKUlHz55tO4I2NXLuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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