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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f7a6c59a2430ef52cc5c4b5bebb374971bfab56f960874b57464ff7cb2e5fd' 
  AND token = '9ZcbAweN4D7VmXLDqhch2m68BVwGJIdnhgwi8Aalb0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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