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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b317aecc649d6cc0311b1a92f0fdb802be4e6407a452f26e1bce9374380d6895' 
  AND token = 'shQjNvoH2f6+U45KutpY6aUrQv6Azh9WuPGNsbDHEP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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