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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d0c66c59f3161f6153d3f4a5a39c0e8c13d38e08065f36d3544f8b96cd6068' 
  AND token = 'XzuPltha6Xwr0qq3uDr4pXU3g0/5/h62smMkeQxPFts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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