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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076746703aafb40a80463cae5283507821fa7d992e05e6df1be63df376842c16' 
  AND token = 'K0DRtGI9B7G/QP/kxDEJ5oKLlsmEo+YCF1xacUtgNyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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