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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add80009a4440c78607e81dd8bb75805376925c24f4b59ebefd6c3715fe885f4' 
  AND token = 'kAvdfbdUVMDAHiJ0P6JxEsZ+0NSBgu+QAkKwVhUFAnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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