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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5f7547a1da21ef81a63b38359b7a4ddaccc04ca8e822e47897e07f70befd50' 
  AND token = 'g6VaUTy8J5ZQpIwaiDwirYifQnPfaBuIRGdllXMvd94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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