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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e838d09c75e6904120ce3f3ecebd82b71bbecfd0f370c90dbb50ad924a13230' 
  AND token = '51O6NHaRh/SvGWWArIT7DYuL0ofr4ZRWqwykHaYry4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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