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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6406fae8d6bb687f6003a9567917cd23ec6d2928661ad84b168a5d934700209d' 
  AND token = 'fcp1vPNnu14uBI8X1I5cw7EAKzuhxD1NKYDfexMxTkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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