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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4f56a9c558c002631f58b393b4e7b4144fa4fc307bf9f45595d32f1b028833' 
  AND token = 'v9Ujl2+8WMlanwrbbiZ7wSArg0UUra7qdRJWBIk57Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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