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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2e80131b6767f963a3b2615baa64104f4061a6d15613fbb60dee4dffec7ceb' 
  AND token = '4NofIHyZO4dpLAsm0i6fqcG2ha3ULbdFdiJSfJxC0dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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